Dielectric Substrate with Protruded Units for Radar Wave Transmission
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Solution Overview
Problem
Radar devices attached to vehicles face performance degradation due to multipath effects and scattering when positioned at the bottom or rear, and existing solutions struggle to improve transmission characteristics on non-uniform dielectric surfaces like windshields.
Innovation Solution
A radar device with a dielectric substrate featuring regularly arranged dielectric units of protruded shapes, which provide spatial impedance matching for radar waves entering the windshield, reducing reflection and enhancing transmission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a radar is attached to the bottom of a vehicle, then the design is not impaired, but the radar performance is greatly deteriorated due to multipath effects
Solution Approach 1:
A dielectric substrate with specific permittivity (4.0-10.0) is introduced as an intermediary between the radar and the vehicle body. This dielectric layer acts as a mediator that controls electromagnetic wave propagation, reducing multipath interference while allowing the radar to be mounted on the vehicle bottom or rear surfaces.
2Ease of manufacture
If a radar is attached to the back of an emblem, then the design is not impaired, but the radar wave is scattered and an appropriate beam pattern is not formed
Solution Approach 1:
The dielectric substrate serves as an intermediary layer between the radar and the emblem surface. It provides a controlled electromagnetic environment that prevents wave scattering caused by the emblem's irregular surface, enabling proper beam pattern formation while maintaining design flexibility.
Solution Approach 2:
By controlling the dielectric constant (permittivity) of the substrate within the range of 4.0-10.0, the electromagnetic wave propagation characteristics are optimized. This parameter control ensures that the radar wave forms an appropriate beam pattern even when mounted on irregular surfaces like emblems.
3Reliability
If a radar is attached inside the vehicle compartment at the upper part of the windshield, then the influence of multipath wave is reduced, but the gain of the radar is greatly reduced due to scattering and loss in the windshield
Solution Approach 1:
The dielectric substrate acts as an intermediary between the radar and the windshield, providing a controlled transition layer that reduces electromagnetic wave scattering and loss. This allows the radar to be mounted inside the vehicle compartment while maintaining higher signal gain compared to direct windshield mounting.
Solution Approach 2:
The system uses a composite structure consisting of the dielectric substrate with specific permittivity properties combined with the windshield material. This composite approach optimizes the electromagnetic wave transmission characteristics, reducing both scattering and energy loss at the interface.
4Loss of energy
If a dielectric layer is provided on the windshield, then the reflection of electromagnetic waves is reduced, but it is difficult to control the transmission characteristic of obliquely incident radar waves
Solution Approach 1:
The patent specifies a dielectric constant range (4.0-10.0) for the substrate material, which provides optimal performance for both reducing reflection and controlling transmission characteristics of obliquely incident radar waves. This parameter specification simplifies the design process while achieving multiple objectives.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses radar wave reflection at the dielectric surface, improving transmission characteristics and maintaining design integrity by allowing flexible attachment to non-uniform surfaces.
Implementation Method 1
multiple dielectric units 30 each having a protruded shape are regularly arranged on one surface of the dielectric substrate 3... the radar wave emitted from the radar main unit 2 enters the multiple dielectric units 30 in a state where another-surface side of the dielectric substrate 3 is attached to a dielectric surface
Implementation Method 2
reflection of the radar wave at the dielectric surface is suppressed
Data Source
AI summary
Included are: a radar main unit for emitting a radar wave and receiving a reflection wave of the radar wave reflected by an object; and a dielectric substrate in which multiple matching layers each having a protruded shape are regularly arranged on one surface of the dielectric substrate, and the radar wave emitted from the radar main unit enters the multiple matching layers in a state where the other-surface side of the dielectric substrate is attached to a windshield.